Class: InlineUploads

Inherits:
Object
  • Object
show all
Defined in:
app/services/inline_uploads.rb

Constant Summary collapse

PLACEHOLDER = 
"__replace__"
PATH_PLACEHOLDER = 
"__replace_path__"

Class Method Summary collapse

Class Method Details

.match_anchor(markdown, external_href: false) ⇒ Object 



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# File 'app/services/inline_uploads.rb', line 187

def self.match_anchor(markdown, external_href: false)
  markdown.scan(%r{((<a[^<]+>)([^<\a>]*?)</a>)}i) do |match|
    node = Nokogiri::HTML5.fragment(match[0]).children[0]
    href = node.attributes["href"]&.value

    if href && (external_href || matched_uploads(href).present?)
      has_attachment = node.attributes["class"]&.value
      index = $~.offset(0)[0]
      text = match[2].strip.gsub("\n", "").gsub(/ +/, " ")
      text = "#{text}|attachment" if has_attachment

      yield(match[0], href, +"[#{text}](#{PLACEHOLDER})", index) if block_given?
    end
  end
end

.match_bbcode_img(markdown, external_src: false) ⇒ Object 



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# File 'app/services/inline_uploads.rb', line 166

def self.match_bbcode_img(markdown, external_src: false)
  markdown.scan(%r{(\[img\]\s*([^\[\]\s]+)\s*\[/img\])}i) do |match|
    if (external_src || (matched_uploads(match[1]).present?)) && block_given?
      yield(match[0], match[1], +"![](#{PLACEHOLDER})", $~.offset(0)[0])
    end
  end
end

.match_img(markdown, external_src: false, uploads: nil) ⇒ Object 



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# File 'app/services/inline_uploads.rb', line 203

def self.match_img(markdown, external_src: false, uploads: nil)
  markdown.scan(%r{(<(?!img)[^<>]+/?>)?(\s*)(<img [^>\n]+>)}i) do |match|
    node = Nokogiri::HTML5.fragment(match[2].strip).children[0]
    src = node&.attributes&.[]("src")&.value

    if src && (external_src || matched_uploads(src).present?)
      upload = uploads&.[](src)
      node["src"] = upload&.short_url || PLACEHOLDER

      spaces_before = match[1].present? ? match[1][/ +$/].size : 0
      replacement = +"#{" " * spaces_before}#{node.to_s}"

      yield(match[2], src, replacement, $~.offset(0)[0]) if block_given?
    end
  end
end

.match_md_inline_img(markdown, external_src: false) ⇒ Object 



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# File 'app/services/inline_uploads.rb', line 153

def self.match_md_inline_img(markdown, external_src: false)
  markdown.scan(/(!?\[([^\[\]]*)\]\(([^\s\)]+)([ ]*['"]{1}[^\)]*['"]{1}[ ]*)?\))/) do |match|
    if (external_src || matched_uploads(match[2]).present?) && block_given?
      yield(
        match[0],
        match[2],
        +"#{match[0].start_with?("!") ? "!" : ""}[#{match[1]}](#{PLACEHOLDER}#{match[3]})",
        $~.offset(0)[0]
      )
    end
  end
end

.match_md_reference(markdown) ⇒ Object 



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# File 'app/services/inline_uploads.rb', line 174

def self.match_md_reference(markdown)
  markdown.scan(/(\[([^\]]+)\]:([ ]+)(\S+))/) do |match|
    if match[3] && matched_uploads(match[3]).present? && block_given?
      yield(
        match[0],
        match[3],
        +"[#{match[1]}]:#{match[2]}#{Discourse.base_url}#{PATH_PLACEHOLDER}",
        $~.offset(0)[0]
      )
    end
  end
end

.process(markdown, on_missing: nil) ⇒ Object 



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# File 'app/services/inline_uploads.rb', line 10

def self.process(markdown, on_missing: nil)
  markdown = markdown.dup

  match_md_reference(markdown) do |match, src, replacement, index|
    if upload = Upload.get_from_url(src)
      markdown = markdown.sub(match, replacement.sub!(PATH_PLACEHOLDER, "__#{upload.sha1}__"))
    end
  end

  cooked_fragment = Nokogiri::HTML5.fragment(PrettyText.cook(markdown, disable_emojis: true))
  link_occurrences = []

  cooked_fragment.traverse do |node|
    if node.name == "img"
      # Do nothing
    elsif !(
          node.children.count == 1 &&
            (node.children[0].name != "img" && node.children[0].children.blank?)
        ) &&
          !(
            node.name == "a" && node.children.count > 1 &&
              !node_children_names(node).include?("img")
          )
      next
    end

    if seen_link = matched_uploads(node).first
      if (actual_link = (node.attributes["href"]&.value || node.attributes["src"]&.value))
        link_occurrences << { link: actual_link, is_valid: true }
      elsif node.name != "p"
        link_occurrences << { link: seen_link, is_valid: false }
      end
    end
  end

  raw_matches = []

  match_bbcode_img(markdown) do |match, src, replacement, index|
    raw_matches << [match, src, replacement, index]
  end

  match_md_inline_img(markdown) do |match, src, replacement, index|
    raw_matches << [match, src, replacement, index]
  end

  match_img(markdown) do |match, src, replacement, index|
    raw_matches << [match, src, replacement, index]
  end

  match_anchor(markdown) do |match, href, replacement, index|
    raw_matches << [match, href, replacement, index]
  end

  regexps = [
    %r{(https?://[a-zA-Z0-9\./-]+/#{Discourse.store.upload_path}#{UPLOAD_REGEXP_PATTERN})},
  ]

  if Discourse.store.external?
    regexps << /((?:https?:)?#{SiteSetting.Upload.s3_base_url}#{UPLOAD_REGEXP_PATTERN})/
    regexps << /(#{SiteSetting.Upload.s3_cdn_url}#{UPLOAD_REGEXP_PATTERN})/
  end

  regexps.each do |regexp|
    indexes = Set.new

    markdown.scan(/(\n{2,}|\A)#{regexp}$/) do |match|
      if match[1].present? && match[2].present?
        extension = match[2].split(".")[-1].downcase
        index = $~.offset(2)[0]
        indexes << index
        if FileHelper.supported_images.include?(extension)
          raw_matches << [match[1], match[1], +"![](#{PLACEHOLDER})", index]
        else
          raw_matches << [match[1], match[1], +"#{Discourse.base_url}#{PATH_PLACEHOLDER}", index]
        end
      end
    end

    markdown.scan(/^#{regexp}(\s)/) do |match|
      if match[0].present?
        index = $~.offset(0)[0]
        next if !indexes.add?(index)
        raw_matches << [match[0], match[0], +"#{Discourse.base_url}#{PATH_PLACEHOLDER}", index]
      end
    end

    markdown.scan(/\[[^\[\]]*\]: #{regexp}/) do |match|
      indexes.add($~.offset(1)[0]) if match[0].present?
    end

    markdown.scan(/(([\n\s\)\]\<])+)#{regexp}/) do |match|
      if matched_uploads(match[2]).present?
        next if !indexes.add?($~.offset(3)[0])
        index = $~.offset(0)[0]
        raw_matches << [match[2], match[2], +"#{Discourse.base_url}#{PATH_PLACEHOLDER}", index]
      end
    end
  end

  raw_matches
    .sort { |a, b| a[3] <=> b[3] }
    .each do |match, link, replace_with, _index|
      node_info = link_occurrences.shift
      next unless node_info&.dig(:is_valid)

      if link.include?(node_info[:link])
        begin
          uri = URI(link)
        rescue URI::Error
        end

        if !Discourse.store.external?
          host = uri&.host

          hosts = [Discourse.current_hostname]

          if cdn_url = GlobalSetting.cdn_url
            hosts << URI(GlobalSetting.cdn_url).hostname
          end

          next if host && !hosts.include?(host)
        end

        upload = Upload.get_from_url(link)

        if upload
          replace_with.sub!(PLACEHOLDER, upload.short_url)
          replace_with.sub!(PATH_PLACEHOLDER, upload.short_path)
          markdown.sub!(match, replace_with)
        else
          on_missing.call(link) if on_missing
        end
      end
    end

  markdown.scan(/(__(\h{40})__)/) do |match|
    upload = Upload.find_by(sha1: match[1])
    markdown = markdown.sub(match[0], upload.short_path)
  end

  markdown
end

.replace_hotlinked_image_urls(raw:, &blk) ⇒ Object 



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# File 'app/services/inline_uploads.rb', line 220

def self.replace_hotlinked_image_urls(raw:, &blk)
  replace =
    Proc.new do |match, match_src, replacement, _index|
      upload = blk.call(match_src)
      next if !upload

      replacement =
        if replacement.include?(InlineUploads::PLACEHOLDER)
          replacement.sub(InlineUploads::PLACEHOLDER, upload.short_url)
        elsif replacement.include?(InlineUploads::PATH_PLACEHOLDER)
          replacement.sub(InlineUploads::PATH_PLACEHOLDER, upload.short_path)
        end

      raw = raw.gsub(match, replacement)
    end

  # there are 6 ways to insert an image in a post
  # HTML tag - <img src="http://...">
  InlineUploads.match_img(raw, external_src: true, &replace)

  # BBCode tag - [img]http://...[/img]
  InlineUploads.match_bbcode_img(raw, external_src: true, &replace)

  # Markdown linked image - [![alt](http://...)](http://...)
  # Markdown inline - ![alt](http://...)
  # Markdown inline - ![](http://... "image title")
  # Markdown inline - ![alt](http://... "image title")
  InlineUploads.match_md_inline_img(raw, external_src: true, &replace)

  raw =
    raw.gsub(%r{^(https?://\S+)(\s?)$}) do |match|
      if upload = blk.call(match)
        "![](#{upload.short_url})"
      else
        match
      end
    end

  raw
end